Comparative Study of the Hemorrhagic Risk in Patients Over 75 Years of Age Taking Enoxaparin

Inclusion criteria: * Subjects of age\> = 75 years * Having a weight\> = 45kg for women and\> = 57kg for men and a BMI \<30, a GFR\> 30 ml / min in Cockcroft-Gault, and having benefited from treatment with Enoxaparin for deep vein thrombosis and / or pulmonary embolism between 01/01/2000 to 11/30/2021. * Subject having been informed by posting in the service and / or via the welcome booklet and not having expressed his opposition to the reuse of his data. Exclusion criteria: * Subject having expressed opposition to participating in the study * History of heparin-induced thrombocytopenia in the last 100 days, * condition associated with a high risk of bleeding such as congenital or acquired blood pathology, * a recent hemorrhagic stroke, * a gastrointestinal ulcer, * the presence of a malignant tumor at high risk of bleeding, recent surgery of the brain, spine or ophthalmology, known or suspected oesophageal varices, arteriovenous malformations, a vascular aneurysm or major intraspinal or intracerebral vascular anomalies.